#26205 closed Uncategorized (needsinfo)
migrate and other commands fail with TypeError: 'NoneType' object has no attribute '__getitem__' in schema.py
Reported by: | D | Owned by: | nobody |
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Component: | Database layer (models, ORM) | Version: | 1.9 |
Severity: | Normal | Keywords: | schema.py PRAGMA NonType migrate |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
Only occurs with a sqlite engine where the command "PRAGMA foreign_keys" returns nothing (instead of returning 0 or 1).
This happens (at least) on sqlite3 v 3.3.6. Doesn't occur on 3.8.11.
The net effect is that the following manage.py comands fail;
migrate
makemigrations
test
plus other commands if they trigger a migration.
Changing line 25 of django/db/backends/sqlite3/schema.py from this;
self._initial_pragma_fk = c.fetchone()[0]
to this
self._initial_pragma_fk = 0 # c.fetchone()[0]
enables you to proceed with the migration.
Change History (6)
comment:1 by , 9 years ago
comment:2 by , 9 years ago
Where does the support for sqlite in django come from? Is it the sqlite module built into python (from 2.5 onwards?)?
If so, how would you upgrade it from 3.3.6 to anything newer?
comment:3 by , 9 years ago
Django uses pysqlite2 if it is installed, but most often it falls back to the sqlite3 integrated module.
On Python 2.7:
$ python2 Python 2.7.9 (default, Mar 1 2015, 12:57:24) [GCC 4.9.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 >>> sqlite3.sqlite_version '3.8.7.1'
follow-up: 6 comment:4 by , 9 years ago
Where do you encounter this old version of SQLite? Django only supports the latest point release of each major version of Python, so if this is with an older point release, I don't think additional documentation is necessary.
comment:5 by , 9 years ago
Component: | Uncategorized → Database layer (models, ORM) |
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Resolution: | → needsinfo |
Status: | new → closed |
comment:6 by , 8 years ago
Replying to timgraham:
Where do you encounter this old version of SQLite? Django only supports the latest point release of each major version of Python, so if this is with an older point release, I don't think additional documentation is necessary.
Tim: This occurs on SME 8.1, which is based on CentOS 5.10
https://wiki.contribs.org/SME_Server:8.1
These packages are currently available in the standard repo:
python-sqlite-1.1.7-1.2.1.0 sqlite-3.3.6-7 sqlite-devel-3.3.6-7
While we don't document a minimum sqlite3 version I don't think we should commit to support a version that is almost 10 years old.
I suggest we document a minimal supported version like we do with other backends.